Durable hardened 40CR alloy steel construction. Suitable for use on Phillips & Pozi head screws. Quick change 1/4” hex shank. Supplied with storage case. This 5-piece set is ideal for removing stripped, broken, stuck, or damaged screws and is an essential addition to any tool kit. Set includes: 1 x #0 (up to 5mm head), 1 x #1 (up to 6mm head), 1 x #2 (up to 10mm head), 1 x #3 (up to 12mm head), 1 x #4 (up to 14mm head).